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INCOME TAXES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
U.S. federal and state:      
Current $ (2,400,000) $ (11,200,000) $ 3,300,000
Deferred (45,300,000) 6,200,000 59,100,000
Uncertain tax positions (400,000) 34,800,000 (63,600,000)
Provision for income taxes (48,100,000) 29,800,000 (1,200,000)
Foreign (Peru and Mexico):      
Current 1,238,700,000 843,500,000 463,200,000
Deferred (86,300,000) (5,200,000) 7,800,000
Provision for income taxes 1,152,400,000 838,300,000 471,000,000
Total provision for income taxes 1,104,335,000 868,071,000 469,861,000
Earnings by location:      
U.S. (1,100,000) (1,000,000) 4,200,000
Foreign (Peru and Mexico) 3,449,800,000 2,431,800,000 1,400,200,000
Income before income taxes $ 3,448,688,000 $ 2,430,780,000 $ 1,404,434,000